You can disagree, but you better tell me where all the physical evidence is.
I can easily understand why there is no physical evidence in this case. While there might be some blood, it wouldn't be a huge amount on the sheets, and there can be other explanations for it. And Dottie, like a woman whose husband cheats on her, may not know.
Look at people like Jim McGreevey. Gay, in the closet, his wife didn't have a clue.
Not believing! The wife always knows!!